Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1f0b08b7c1e923…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 16:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55c830f658ad8b9da14575d7d7991583 SHA-1: 87b4b9a691f1dca592e4e67132fd504f32432a3c SHA-256: 3b1f0b08b7c1e9233a46ac425103a91c070af7e5d5de9da61ec5d25d744f4199
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of a 'download' button heuristic further supports this, although the document body itself is unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://beiwendq.com/userfiles/file/90969798345.pdf In PDF document text
    • http://shinies.ru/img/lib/file/21836726661.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/37875431905.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/gegar.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/lomofebupoludazo.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/fugudipuz.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/geladupudepe.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/marakipeximijewokamozo.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/fusunizosixe.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/latemizigelid.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16314836137162.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/36503211654.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/padatexuvan.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/524mhjnplk09mnnh9o82pcctlb/80688882505.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/13031139669.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1ve80qkpdjmsa4baopi5c96do2/sezume.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/38377137814.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/33137535993.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/71083077801.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/vumorovugobasukajinog.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/77286086970.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f3b92fbb---wutarixijujutozefomus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=kingroot+latest+apk+2021PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 10804 bytes
SHA-256: 87d5d51307a0adfb5185cd568c3ee1bd7d57824630b37726cb98113d73b87f26
font_02_sfnt_off000115cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 18380 bytes
SHA-256: 295eee9dbc9a05e43dcb9456929224642aed89378071232b8ebc38027264b216

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